topology: xlink syntax errors

[aperi2007]

Hi,

try-ing to use the AsGML with visited table the actul sintax is like this:

<rt:directedNode xlink:xref="N3" />

there two sintax errors:

xlink:href instead of xlink:xref and the link must have an anchor(#) so the right sintax is:

<rt:directedNode xlink:href="#N3" />

[strk]

Fixed in r6740